BX Boötis

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BX Boötis
BXBooLightCurve.png
The visual band light curve of BX Boötes, adapted from Adelman (2008) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Boötes
Right ascension 15h 00m 38.7179s [2]
Declination +47° 16′ 38.792″ [2]
Apparent magnitude  (V)6.33 to 6.41 [3]
Characteristics
Spectral type A0 Vsp SiSrCr [4] or B9 Vp SiCrSr [5]
B−V color index −0.099±0.004 [6]
Variable type α2 CVn [7]
Astrometry
Radial velocity (Rv)−10.7±1.8 [8]  km/s
Proper motion (μ)RA: -8.999 [2]   mas/yr
Dec.: 15.852 [2]   mas/yr
Parallax (π)6.3665 ± 0.0287  mas [2]
Distance 512 ± 2  ly
(157.1 ± 0.7  pc)
Absolute magnitude  (MV)0.21 [6]
Details
Mass 2.70±0.09 [9]   M☉
Radius 2.51 [10]   R☉
Luminosity 72.4+10.8
−12.1 [9]   L☉
Surface gravity (log g)4.50 [11]   cgs
Temperature 9,164 [11]   K
Metallicity [Fe/H]+0.63 [11]   dex
Rotation 2.88756 d [1]
Rotational velocity (v sin i)30 [12]  km/s
Age 235 [13]   Myr
Other designations
BX Boo, BD+47° 2192, FK5  3247, HD  133029, HIP  73454, HR  5597, SAO  45326 [14]
Database references
SIMBAD data

BX Boötis is a star in the northern constellation of Boötes. It is a dim star near the lower limit of visibility to the naked eye, having a nominal apparent visual magnitude of 6.35. [10] Based upon an annual parallax shift of 6.3665  mas , [2] it is located 512  light years away. At that distance, the visual magnitude of the star is diminished by an extinction of 0.13 due to interstellar dust. [13] It is moving closer with a heliocentric radial velocity of −11 km/s. [8]

The variability of BX Boötis was probably discovered by Gerhard Robert Miczaika. It was announced in a 1954 IAU publication, where he discusses photo-electric measurements of spectrum variables. He wrote "The magnetic-field variable HD 133129 is likewise variable in magnitude with a small amplitude." [15] HD 133129 is not BX Boötis, but HD 133029 is. Unlike BX Boötis, HD 133129 does not match Miczaika's description of the star. Kukarkin et al. apparently concluded there was a typographical error in Miczaika's announcement, because they cited Miczaika's 1954 announcement when they gave BX Boötis its variable star designation in 1972. [16]

This is a magnetic CP star [1] with a stellar classification of A0 Vsp SiSrCr, [4] indicating this is an A-type main-sequence star. The spectrum has very weak lines of helium but displays strong overabundances of silicon and all of the heavier elements except nickel. [17] It is classified as an Alpha² Canum Venaticorum variable [7] with a magnitude that varies from 6.33 to 6.41 [3] over a period of 2.88756 days. [1]

BX Boötis is 235 [13]  million years old with a projected rotational velocity of 30 [12]  km/s. It has 2.7 [9] times the mass of the Sun and 2.5 [10] times the Sun's radius. The star is radiating around 72 [9] times the Sun's luminosity from its photosphere at an effective temperature of 9,164 K. [11]

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References

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  11. 1 2 3 4 Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069 , Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID   118362423.
  12. 1 2 Strom, Stephen E.; et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal, 129 (2): 809–828, arXiv: astro-ph/0410337 , Bibcode:2005AJ....129..809S, doi:10.1086/426748, S2CID   15059129.
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  14. ↑ "HD 46052". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 22 August 2018.
  15. ↑ Miczaika, G. R. (September 1954). "Photometric Measurements of Magnetic-Field and Spectrum Variables" (PDF). Transactions of the International Astronomical Union. 8: 805. Retrieved 3 December 2024.
  16. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (September 1972). "58th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 717. Bibcode:1972IBVS..717....1K . Retrieved 2 December 2024.
  17. ↑ López-García, Z.; Adelman, S. J. (June 1999), "Elemental abundance studies of CP stars. II. The silicon stars HD 133029 and HD 192913", Astronomy and Astrophysics Supplement, 137 (2): 227–232, Bibcode:1999A&AS..137..227L, doi: 10.1051/aas:1999247 .
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